Dhariwal was interrogated for nearly two hours, an ACB official said.
It is for the second time that he was questioned and he would be called again if required, the official said.
Dhariwal has rejected the allegation of his involvement in the case.
The ACB had also summoned former former Additional Chief Secretary G S Sandhu but he did not turn, the official said.
The ACB has already arrested the company owner Shailendra Garg and RAS officer Nishkam Diwakar in connection with the case.
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